The phrase "last act" can be replaced with a variety of synonyms to convey the final moments or conclusion of a particular event. Some possible synonyms include "finale," "closing scene," "final curtain," "culmination," "ending," "conclusion," "final performance," "climax," "finishing touch," "last hurrah," and "farewell." Depending on the context, some synonym choices may be more appropriate than others. For example, "final performance" would be a fitting synonym for the last act of a play or concert, while "farewell" would be more appropriate for the last act of a career or lifetime achievement.